问题
Some Windows native applications have a question mark icon on the title bar. It's usually at the right edge, just near the close button. How can I do this in a C# WinForms application? I'd like a solution that works in Windows XP onward.
回答1:
Set the form's HelpButton property to True. You also need to have the MaximizeButton and MinimizeButton properties set to False.
来源：https://stackoverflow.com/questions/1112472/adding-help-icon-to-winforms-form-titlebar